I only ever wore body armour once in my entire career. Just the plate carrier, no plate. Which was a bit disconcerting as I was on a firing range with people shooting a tactical-ish course of fire pretty close to me. It was blackly pointed out that all the plate carrier would do was keep me in a nice neat package for burial later.
Giving the possessors of jumpers who are slightly more lumpy than usual some body armour, mit plates, that actually fit them is a Good Thing and a brilliant idea. One then wonders how the Army came up with it.